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Earth and Space Sciences · 术语表

什么是 Brightness temperature？

Definition 25.6 University Earth and Space Sciences — Year 3 · 第 25 章 — Remote Sensing and GIS

The brightness temperature $T_b$ of a surface at the wavelength $\lambda$ is the temperature of the black body that would emit the spectral radiance $L$ measured from it at that wavelength. The kinetic temperature is the surface’s thermodynamic temperature, the one a thermometer would read.

$Left, Planck’s law for surfaces at 300 and 400\, K and for the lava of an eruption at 1170\, C (1443\, K), with the shortwave infrared band 7 and the thermal band 10 of Landsat 8 shaded. Right, the brightness temperature in band 10 of a pixel in which a fraction f is at 370\, K and the rest at 290\, K, against the area-weighted mean temperature: the hot part counts for more than its area.$

Left, Planck’s law for surfaces at 300 and

400\,\mathrm{K}

and for the lava of an eruption at

1170\,{}^{\circ}\mathrm{C}

(

1443\,\mathrm{K}

), with the shortwave infrared band 7 and the thermal band 10 of Landsat 8 shaded. Right, the brightness temperature in band 10 of a pixel in which a fraction

f

is at

370\,\mathrm{K}

and the rest at

290\,\mathrm{K}

, against the area-weighted mean temperature: the hot part counts for more than its area.

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